purpose this study investigated the effects of time-of-day on aerobic and anaerobic performances during the yo-yo, repeated sprint ability (rsa) and the wingate tests in young soccer players. methods in a counterbalanced and a random order, twenty junior male soccer players completed the yo-yo, the rsa, and the wingate tests at two different times-of-day: 07:00 and 17:00 h. during the yo-yo tes...

introduction: depression as a disorder is relatively common in all societies several factors are involved in depression development, that shift work is one of these factors. this study compared the frequency of depression in different shifts of nurses in hospitals of yazd university of medical sciences. materials & methods: this study is a descriptive analytical study. based on statistical meth...

conclusions the study findings highlight the importance of the mental aspect of fatigue in this working group. these results have possible implications for workers’ health and well-being and for the design of shift work systems, for industrial workers. background shift work is a well-recognized occupational health hazard in both industrialized and industrially developing countries. prolonged wo...

Circadian rhythm is an evolutionarily conserved mechanism from archaea to human. To deal with the day-night changes in the environment on earth, circadian rhythm modulates the biological function to coordinate an appropriate timing for each process. Circadian rhythm and exercise have important impacts on each other. Exercise is a strong entrainment signal for mammalian circadian clock. 1 Proper...

Breast cancer is the most common malignancy among women, both in the developed and developing countries. Women with mutations in the BRCA1 and BRCA2 genes have an increased risk of breast and ovarian cancers. Recent studies show that short-wavelength visible light disturb the secretion of melatonin and causes circadian rhythm disruption. We have previously studied the health effects of exposure...

Age-related effects on circadian rhythms include reductions of rhythm amplitude, alterations in re-entrainment, and increased fragmentation. Currently, the pattern of these changes across an individuals' lifespan is unknown. The present study used a cross-sequential experimental design to determine the pattern of circadian rhythm changes, identify predictors of later circadian rhythm disruption...